Flexible Display Bend Structure for Crack-Resistant Wiring
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Solution Overview
Problem
Cracks in the flexible substrate or wiring of flexible display devices occur when bending, leading to potential failure.
Innovation Solution
Incorporating a first and second back plate with a supporting member between them, along with a cover coat and drive integrated circuit connection members like TCP or COF, to stabilize the flexible substrate during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display device is bent to achieve flexibility, then the device can be folded and adapted to various shapes, but cracks occur in the flexible substrate or wiring leading to device failure
Solution Approach 1:
A support structure comprising a first support member and a second support member is provided underneath the flexible substrate. The first support member extends along a first direction and the second support member extends along a second direction that is different from the first direction. This cross-shaped support structure prevents cracks from occurring in the flexible substrate or wiring when the device is bent, thereby cushioning against potential damage before it can occur.
Solution Approach 2:
The support structure introduces a dimensional element by placing support members in a direction perpendicular to the flexible substrate's surface. The first support member extends in a first direction and the second support member extends in a second direction different from the first, creating a three-dimensional support framework underneath the two-dimensional flexible substrate to prevent crack propagation during bending.
2Reliability
If support structures are added to prevent cracks during bending, then reliability is improved, but device complexity increases
Solution Approach 1:
The support structure is segmented into multiple independent support members: a first support member extending along a first direction and a second support member extending along a second direction. This segmentation allows each support member to independently provide structural reinforcement in specific directions, preventing cracks while maintaining a relatively simple overall structure that can be manufactured separately and assembled.
Data Source
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AI summary
A display apparatus (700), comprises: a substrate (710) including a display area (DA) and a non-display area (NA); the non-display area (NA) including a first area, a bend area and a second area, the second area bent behind the first area via the bend area; a display layer (730) on the substrate (710); an adhesive layer (739) on the display layer (730) ; a polarizing layer (732) on the adhesive layer (739); a cover layer (736) on the polarizing layer (732); a second adhesive layer (734) located between the polarizing layer (732) and the cover layer (736); a drive integrated circuit connection member (750) on the second area; a wiring routed from the first area to the second area; a cover coat (740) covering the bend area, the cover coat (740) having an edge portion between the display layer (730) and the adhesive layer (739), wherein the cover coat (740) is disposed apart from the cover layer (736).